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Optical Engineering

Through-wafer optical probe characterization for microelectromechanical systems positional state monitoring and feedback control
Author(s): Jeremy M. Dawson; Jingdong Chen; Kolin S. Brown; Parviz F. Famouri; Lawrence Anthony Hornak
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Paper Abstract

Implementation of closed-loop microelectromechanical system (MEMS) control enables mechanical microsystems to adapt to the demands of the environment that they are actuating, opening a broad range of new opportunities for future MEMS applications. Integrated optical microsystems have the potential to enable continuous in situ optical interrogation of MEMS microstructure position fully decoupled from the means of mechanical actuation that is necessary for realization of feedback control. We present the results of initial research evaluating through-wafer optical microprobes for surface micromachined MEMS integrated optical position monitoring. Results from the through-wafer freespace optical probe of a lateral comb resonator fabricated using the multiuser MEMS process service (MUMPS) indicate significant positional information content with an achievable return probe signal dynamic range of up to 80% arising from film transmission contrast. Static and dynamic deflection analysis and experimental results indicate a throughwafer probe positional signal sensitivity of 40 mV/?m for the present setup or 10% signal change per micrometer. A simulation of the application of nonlinear sliding control is presented illustrating position control of the lateral comb resonator structure given the availability of positional state information.

Paper Details

Date Published: 1 December 2000
PDF: 8 pages
Opt. Eng. 39(12) doi: 10.1117/1.1327177
Published in: Optical Engineering Volume 39, Issue 12
Show Author Affiliations
Jeremy M. Dawson, West Virginia Univ. (United States)
Jingdong Chen, West Virginia Univ. (United States)
Kolin S. Brown, West Virginia Univ. (United States)
Parviz F. Famouri, West Virginia Univ. (United States)
Lawrence Anthony Hornak, West Virginia Univ. (United States)

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